3030% is the change from 30 to 939
Calculation steps:
[( 939 - 30 ) ÷ 30] x 100 = 3030%
Formula
Percentage change = [(939 - 30) / 30] x 100
Subtract the new number by the original number
939 - 30 = 909
909 ÷ 30 = 30.3
30.3 x 100 = 3030%
Example